swift - 将 Sprite 附加到 SKPhysicsBody

Question

我正在制作一个 Sprite 动画，当它接触到另一个 Sprite 时，会调用一个物理接触函数。然后，在这个函数中，我试图让 Sprite 接触到另一个。它的主体是 bodyA 但它是一个 SKPhysicsBody，它不能转换为 SKSpriteNode。你有什么想法？接触时正确调用该函数，我只是尝试获取 body 接触的 Sprite 。最终的想法是通过我正在寻找的方式将 Action 附加到 sprite，但我想当您拥有 sprite 时，这很容易。

    let shootCategory: UInt32 = 0x1 << 0
    let enemyCategory: UInt32 = 0x1 << 1


    // Declaration of the SKPhysicsBody of the sprite wich will touch the other one
    sprite.physicsBody = SKPhysicsBody(circleOfRadius: (20))
    sprite.physicsBody?.usesPreciseCollisionDetection = true
    sprite.physicsBody?.categoryBitMask = shootCategory
    sprite.physicsBody?.collisionBitMask = shootCategory | enemyCategory
    sprite.physicsBody?.contactTestBitMask = shootCategory | enemyCategory
    sprite.physicsBody?.affectedByGravity = false

    // Declaration of the SKPhysicsBody of the sprite wich will be touched
    sprite.run(SKAction.group([moveAction, fadeInAction]))
    sprite.physicsBody = SKPhysicsBody(circleOfRadius: (20))
    sprite.physicsBody?.usesPreciseCollisionDetection = true
    sprite.physicsBody?.categoryBitMask = enemyCategory
    sprite.physicsBody?.collisionBitMask = shootCategory | enemyCategory
    sprite.physicsBody?.contactTestBitMask = shootCategory | enemyCategory
    sprite.physicsBody?.affectedByGravity = false


    func didBegin(_ contact: SKPhysicsContact) {

    if (contact.bodyA.categoryBitMask == enemyCategory) && (contact.bodyB.categoryBitMask == shootCategory){

        // I tried this to get the sprite wich the bodyB is attached to but it doesn't even build
        let sprite: SKSpriteNode = sprite.contact.bodyB
        contact.bodyA.removeAction(forKey: "moveToAction")
    }
}

Answer 1

我终于找到了非常简单的解决方案:

    let Node = contact.bodyB.node as! SKSpriteNode